php井字游戏代码_反应井字游戏
我今天开始学习react,我按照reactjs.org网站. 大部分是可以理解的,但我不明白赢家是怎么计算出来的。。。我将包括下面的全部代码,但我的问题是calculatewiner函数。如果有人能解释一下背后的逻辑,我会很高兴的。
function Square(props) {
return ( <
button className = "square"
onClick = {
props.onClick
} > {
props.value
} <
/button>
);
}
class Board extends React.Component {
constructor(props) {
super(props);
this.state = {
squares: Array(9).fill(null),
xIsNext: true,
};
}
handleClick(i) {
const squares = this.state.squares.slice();
squares[i] = this.state.xIsNext ? 'X' : 'O';
this.setState({
squares: squares,
xIsNext: !this.state.xIsNext,
});
}
renderSquare(i) {
return ( <
Square value = {
this.state.squares[i]
}
onClick = {
() => this.handleClick(i)
}
/>
);
}
render() {
const winner = calculateWinner(this.state.squares);
let status;
if (winner) {
status = 'A gyÅztes: ' + winner;
} else {
status = 'KövetkezŠjátékos ' + (this.state.xIsNext ? 'X' : 'O');
}
return ( <
div >
<
div className = "status" > {
status
} < /div> <
div className = "board-row" > {
this.renderSquare(0)
} {
this.renderSquare(1)
} {
this.renderSquare(2)
} <
/div> <
div className = "board-row" > {
this.renderSquare(3)
} {
this.renderSquare(4)
} {
this.renderSquare(5)
} <
/div> <
div className = "board-row" > {
this.renderSquare(6)
} {
this.renderSquare(7)
} {
this.renderSquare(8)
} <
/div> <
/div>
);
}
}
class Game extends React.Component {
render() {
return ( <
div className = "game" >
<
div className = "game-board" >
<
Board / >
<
/div> <
div className = "game-info" >
<
div > {
/* status */ } < /div> <
ol > {
/* TODO */ } < /ol> <
/div> <
/div>
);
}
}
ReactDOM.render( <
Game / > ,
document.getElementById('root')
);
function calculateWinner(squares) {
const lines = [
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
[0, 3, 6],
[1, 4, 7],
[2, 5, 8],
[0, 4, 8],
[2, 4, 6],
];
for (let i = 0; i < lines.length; i++) {
const [a, b, c] = lines[i];
if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
return squares[a];
}
}
return null;
}
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